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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/sys/powerpc/pseries/phyp-hvcall.S
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/*-

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 * Copyright (C) 2010 Andreas Tobler

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 * All rights reserved.

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 *

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 * Redistribution and use in source and binary forms, with or without

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 * modification, are permitted provided that the following conditions

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 * are met:

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 * 1. Redistributions of source code must retain the above copyright

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 *    notice, this list of conditions and the following disclaimer.

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 * 2. Redistributions in binary form must reproduce the above copyright

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 *    notice, this list of conditions and the following disclaimer in the

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 *    documentation and/or other materials provided with the distribution.

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 *

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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

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 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

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 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

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 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

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 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

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 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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 */

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#include <machine/asm.h>

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/* Hypervisor entry call. */

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#define  hc  .long 0x44000022

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/*

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 * Simple HV calls take the same arguments, with the same ABI, as this

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 * C function

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 */

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ASENTRY(phyp_hcall)

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	mflr	%r0

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	std	%r0,16(%r1)

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#if defined(_CALL_ELF) && _CALL_ELF == 2

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	ld	%r11,96(%r1)		/* Last couple args into volatile regs*/

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	ld	%r12,104(%r1)

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#else

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	ld	%r11,112(%r1)		/* Last couple args into volatile regs*/

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	ld	%r12,120(%r1)

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#endif

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	hc				/* invoke the hypervisor */

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	ld	%r0,16(%r1)

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	mtlr	%r0

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	blr				/* return r3 = status */

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ASEND(phyp_hcall)

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/*

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 * PFT HV calls take a special ABI (see PAPR 14.5.4.1)

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 *

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 * r3-r7 arguments passed unchanged, r8-r10 are addresses of return values

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 * HV takes the same r3-r7, but returns values in r3, r4-r6

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 */

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ASENTRY(phyp_pft_hcall)

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	mflr	%r0

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	std	%r0,16(%r1)

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	stdu	%r1,-80(%r1)

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	std	%r8,48(%r1)		/* save arguments */

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	std	%r9,56(%r1)

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	std	%r10,64(%r1)

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	hc				/* invoke the hypervisor */

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	ld	%r11,48(%r1)		/* store results */

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	std	%r4,0(%r11)

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	ld	%r11,56(%r1)

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	std	%r5,0(%r11)

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	ld	%r11,64(%r1)

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	std	%r6,0(%r11)

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	ld	%r1,0(%r1)		/* exit */

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	ld	%r0,16(%r1)

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	mtlr	%r0

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	blr				/* return r3 = status */

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ASEND(phyp_pft_hcall)

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